/*
 * Copyright 2015 The Netty Project
 *
 * The Netty Project licenses this file to you under the Apache License,
 * version 2.0 (the "License"); you may not use this file except in compliance
 * with the License. You may obtain a copy of the License at:
 *
 *   http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
 * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
 * License for the specific language governing permissions and limitations
 * under the License.
 */
package io.netty.buffer;

/**
 * Utility class for heap buffers.
 */
final class HeapByteBufUtil {

  static byte getByte(byte[] memory, int index) {
    return memory[index];
  }

  static short getShort(byte[] memory, int index) {
    return (short) (memory[index] << 8 | memory[index + 1] & 0xFF);
  }

  static short getShortLE(byte[] memory, int index) {
    return (short) (memory[index] & 0xff | memory[index + 1] << 8);
  }

  static int getUnsignedMedium(byte[] memory, int index) {
    return (memory[index] & 0xff) << 16 |
        (memory[index + 1] & 0xff) << 8 |
        memory[index + 2] & 0xff;
  }

  static int getUnsignedMediumLE(byte[] memory, int index) {
    return memory[index] & 0xff |
        (memory[index + 1] & 0xff) << 8 |
        (memory[index + 2] & 0xff) << 16;
  }

  static int getInt(byte[] memory, int index) {
    return (memory[index] & 0xff) << 24 |
        (memory[index + 1] & 0xff) << 16 |
        (memory[index + 2] & 0xff) << 8 |
        memory[index + 3] & 0xff;
  }

  static int getIntLE(byte[] memory, int index) {
    return memory[index] & 0xff |
        (memory[index + 1] & 0xff) << 8 |
        (memory[index + 2] & 0xff) << 16 |
        (memory[index + 3] & 0xff) << 24;
  }

  static long getLong(byte[] memory, int index) {
    return ((long) memory[index] & 0xff) << 56 |
        ((long) memory[index + 1] & 0xff) << 48 |
        ((long) memory[index + 2] & 0xff) << 40 |
        ((long) memory[index + 3] & 0xff) << 32 |
        ((long) memory[index + 4] & 0xff) << 24 |
        ((long) memory[index + 5] & 0xff) << 16 |
        ((long) memory[index + 6] & 0xff) << 8 |
        (long) memory[index + 7] & 0xff;
  }

  static long getLongLE(byte[] memory, int index) {
    return (long) memory[index] & 0xff |
        ((long) memory[index + 1] & 0xff) << 8 |
        ((long) memory[index + 2] & 0xff) << 16 |
        ((long) memory[index + 3] & 0xff) << 24 |
        ((long) memory[index + 4] & 0xff) << 32 |
        ((long) memory[index + 5] & 0xff) << 40 |
        ((long) memory[index + 6] & 0xff) << 48 |
        ((long) memory[index + 7] & 0xff) << 56;
  }

  static void setByte(byte[] memory, int index, int value) {
    memory[index] = (byte) value;
  }

  static void setShort(byte[] memory, int index, int value) {
    memory[index] = (byte) (value >>> 8);
    memory[index + 1] = (byte) value;
  }

  static void setShortLE(byte[] memory, int index, int value) {
    memory[index] = (byte) value;
    memory[index + 1] = (byte) (value >>> 8);
  }

  static void setMedium(byte[] memory, int index, int value) {
    memory[index] = (byte) (value >>> 16);
    memory[index + 1] = (byte) (value >>> 8);
    memory[index + 2] = (byte) value;
  }

  static void setMediumLE(byte[] memory, int index, int value) {
    memory[index] = (byte) value;
    memory[index + 1] = (byte) (value >>> 8);
    memory[index + 2] = (byte) (value >>> 16);
  }

  static void setInt(byte[] memory, int index, int value) {
    memory[index] = (byte) (value >>> 24);
    memory[index + 1] = (byte) (value >>> 16);
    memory[index + 2] = (byte) (value >>> 8);
    memory[index + 3] = (byte) value;
  }

  static void setIntLE(byte[] memory, int index, int value) {
    memory[index] = (byte) value;
    memory[index + 1] = (byte) (value >>> 8);
    memory[index + 2] = (byte) (value >>> 16);
    memory[index + 3] = (byte) (value >>> 24);
  }

  static void setLong(byte[] memory, int index, long value) {
    memory[index] = (byte) (value >>> 56);
    memory[index + 1] = (byte) (value >>> 48);
    memory[index + 2] = (byte) (value >>> 40);
    memory[index + 3] = (byte) (value >>> 32);
    memory[index + 4] = (byte) (value >>> 24);
    memory[index + 5] = (byte) (value >>> 16);
    memory[index + 6] = (byte) (value >>> 8);
    memory[index + 7] = (byte) value;
  }

  static void setLongLE(byte[] memory, int index, long value) {
    memory[index] = (byte) value;
    memory[index + 1] = (byte) (value >>> 8);
    memory[index + 2] = (byte) (value >>> 16);
    memory[index + 3] = (byte) (value >>> 24);
    memory[index + 4] = (byte) (value >>> 32);
    memory[index + 5] = (byte) (value >>> 40);
    memory[index + 6] = (byte) (value >>> 48);
    memory[index + 7] = (byte) (value >>> 56);
  }

  private HeapByteBufUtil() {
  }
}
